<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>
	<body>
	</body>
	<script type="text/javascript">
//	如果属性直接存在于对象中  也在原型链上
		Object.prototype.a="prototypeA";
		console.log(Object.prototype)
		
		var obj={
			get a(){
				return this._a_;
			},
			set a(val){
				this._a_="_a_";
			}
		}
		obj.a="b";
		console.log(obj)
		console.log(Object.prototype)
	</script>
</html>
